A new three-jaw chuck

Abstract

The application discloses a novel three-jaw chuck, which comprises a disc body, a plurality of clamping claws slidingly arranged on the disc body, a plurality of clamping claw grooves formed in the disc body, the clamping claws arranged in the clamping claw grooves, a driving assembly arranged in the disc body, a clamping part formed and extended on the clamping claw, the driving of the clamping claw moving inward, the abutting of the clamping part with the side surface of the convex edge of a workpiece, the clamping part being provided with a buckling device, the buckling device comprising a buckling block rotatably arranged on the upper end of the clamping part and a buckling sheet fixed to the inner side of the buckling block, the clamping part being provided with a pushing device for driving the buckling block to rotate, when the buckling block rotates on the clamping part, the buckling block can drive the buckling sheet to move downward and press above the convex edge of the workpiece, so that the workpiece is prevented from being thrown out of the three-jaw chuck during machining, and the novel three-jaw chuck has the advantages of simple structure, the clamping claw can still stably fix the workpiece on the disc body when machining the workpiece with large volume, long length and convex edge, and the workpiece is prevented from being thrown out during machining.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of chucks, in particular to a novel three-jaw chuck. BACKGROUND

[0002] The chuck is a mechanical device for clamping workpieces on a machine tool, and the three-jaw chuck is generally composed of a disc body, a chuck jaw, and a driving assembly for driving the chuck jaw to move. It mainly uses the radial movement of the chuck jaw uniformly distributed on the disc body to clamp and position the workpiece. The three-jaw chucks on the market all have the same problem. When processing a workpiece with a large volume, a long length, and a convex edge, such as a workpiece with a flange, the contact area between the chuck jaw and the workpiece is reduced because the chuck jaw can only contact the convex edge of the workpiece. Since the three-jaw chuck drives the workpiece to rotate at high speed during processing, the centrifugal force generated by the workpiece with a large volume and a long length will be very large. The inward clamping force of the chuck jaw cannot fix the workpiece on the chuck, and the workpiece will be thrown out of the three-jaw chuck during processing, affecting the normal processing of the workpiece. SUMMARY

[0003] The purpose of the present application is to provide a novel three-jaw chuck with a simple structure that can stably fix a workpiece with a large volume, a long length, and a convex edge on the disc body during processing, preventing the workpiece from being thrown out during processing.

[0004] The purpose of the present application is achieved as follows:

[0005] A novel three-jaw chuck includes a disc body and a plurality of chuck jaws slidingly arranged on the disc body. A plurality of chuck jaw grooves are formed in the disc body, and the chuck jaws are arranged in the chuck jaw grooves. A driving assembly is provided in the disc body for driving the chuck jaws to move forward and backward in the chuck jaw grooves. A clamping portion is formed on the chuck jaw and extends outward. The chuck jaw moves inward, and the clamping portion abuts against the side surface of the convex edge of the workpiece. A buckling device is provided on the clamping portion. The buckling device includes a buckling block rotatably arranged on the upper end of the clamping portion and a buckling piece fixed to the inner side of the buckling block. A pushing device is provided on the clamping portion to drive the buckling block to rotate. When the buckling block rotates on the clamping portion, the buckling piece is driven to move downward and press above the convex edge of the workpiece, thereby preventing the workpiece from being thrown out of the three-jaw chuck during processing.

[0006] Further, the pushing device comprises an elastic plate and a top head assembly fixedly arranged on the surface of the disc body, the top head assembly is located on one side or both sides of the clamping jaw, the upper end of the elastic plate is connected with the fastening block, the lower end of the elastic plate is located on one side or both sides of the clamping jaw and abuts against the outer side of the top head assembly, when the clamping jaw moves inward, the clamping portion drives the fastening block to move inward, the lower end of the elastic plate abuts against the top head assembly and limits the inward movement of the lower end of the elastic plate, at this time, the upper end of the elastic plate continues to move inward and rotates around the lower end, the rotation of the elastic plate drives the fastening block connected with the upper end to rotate, the rotation of the fastening block drives the fastening sheet to move downward, and the fastening sheet is pressed above the convex edge of the workpiece.

[0007] Further, the top head assembly comprises a fixed seat and a top rod arranged on the fixed seat, one end of the top rod abuts against the lower end of the elastic plate, the fixed seat is fixedly installed on the surface of the disc body, the fixed seat is provided with a positioning hole, the top rod is arranged in the positioning hole, and the top rod can be adjusted forward and backward in the adjusting hole.

[0008] Further, the disc body is provided with a disc hole, the fixed seat is provided with a positioning hole, the positioning hole and the disc hole are provided with a positioning rod, the inner wall of the clamping jaw groove is provided with a guide strip, the bottom of the clamping jaw is provided with a guide groove, and the guide strip is arranged in the guide groove.

[0009] Further, the clamping portion is provided with a rotating groove, the fastening block is hingedly arranged in the rotating groove, the rotating groove is provided with an elastic member, the bottom end of the elastic member abuts against the bottom of the rotating groove, and the top end of the elastic member abuts against the lower surface of the fastening block.

[0010] Further, the elastic member comprises a mounting plate and an elastic sheet, the mounting plate is in the shape of "L", one end of the mounting plate is arranged in the rotating groove, and the elastic sheet is arranged on one end of the mounting plate in an inclined manner.

[0011] Further, the rotating groove is provided with a connecting hole on both sides, the fastening block is provided with a rotating hole, and the rotating hole and the connecting hole are provided with a rotating rod.

[0012] Further, the fastening block is provided with a fixing groove, the elastic plate comprises a connecting portion and a limiting sheet arranged on the connecting portion in a symmetrical manner, one end of the top head assembly abuts against the lower end of the limiting sheet, the fastening block and the clamping portion are arranged between the symmetrical limiting sheets, the middle part of the connecting portion is extended to form a fixing portion, the fixing portion is arranged in the fixing groove, the fixing portion is provided with a fixing hole, the fastening block is further provided with a through hole penetrating through the fixing groove, and the through hole and the fixing hole are provided with a fixing rod.

[0013] Further, the fastening block is further provided with a mounting hole, the fastening sheet is provided with a waist hole, and the waist hole and the mounting hole are provided with a mounting rod.

[0014] Further, the inner side of the fastening block is provided with first teeth, and the inner side of the fastening sheet is provided with second teeth engaged with the first teeth.

[0015] The present application has the following prominent and beneficial technical effects compared with the prior art:

[0016] A novel three-jaw chuck comprises a disc body and a plurality of clamping jaws slidingly arranged on the disc body, a plurality of clamping jaw grooves are formed in the disc body, the clamping jaws are arranged in the clamping jaw grooves, a driving assembly is arranged in the disc body for driving the clamping jaws to move forward and backward in the clamping jaw grooves, a clamping portion is formed on the clamping jaw and extends therefrom, the clamping portion is arranged to abut against the side surface of the convex edge of a workpiece when the clamping jaw is driven to move inward, a fastening device is arranged on the clamping portion, the fastening device comprises a fastening block rotatably arranged on the upper end of the clamping portion and a fastening sheet fixed to the inner side of the fastening block, a pushing device is arranged on the clamping portion for driving the fastening block to rotate, the fastening block can drive the fastening sheet to move downward and press above the convex edge of the workpiece when the fastening block rotates on the clamping portion, thereby preventing the workpiece from being thrown out of the three-jaw chuck during machining; the driving assembly is a common device on the three-jaw chuck on the market, the clamping jaws can be driven to move radially by controlling the driving assembly, when a user wants to machine a workpiece with large volume, long length and convex edge, the workpiece is first placed on the disc body, and then the clamping jaws on the disc body are driven to move inward along the clamping jaw grooves at the same time, since the fastening block is rotatably arranged on the upper end of the clamping portion of the clamping jaw and the pushing device capable of driving the fastening block to rotate is arranged on the clamping portion, the pushing device drives the fastening block to rotate when the clamping jaw moves inward to a certain position, since the fastening sheet is arranged on the fastening block, the fastening block drives the fastening sheet to move downward after rotating on the upper end of the clamping portion, and finally the clamping portion abuts against the side surface of the convex edge of the workpiece, and at the same time the fastening sheet abuts against the upper surface of the convex edge of the workpiece after moving downward, compared with the clamping jaws on the three-jaw chuck on the market, when the workpiece with convex edge is clamped, since the clamping jaws can only clamp the side edge of the convex edge of the workpiece, the contact surface between the clamping jaws and the workpiece is reduced, and the workpiece is easily thrown in the machining process, thereby causing danger, the clamping jaws of the present application not only provide a horizontal clamping force to the workpiece through the clamping portion, but also make the fastening sheet abut against the upper surface of the convex edge of the workpiece, so that the fastening sheet provides a vertical clamping force to the workpiece, thereby enabling the workpiece with large volume, long length and convex edge to be fixed on the disc body, improving the fixing effect of the workpiece, preventing the workpiece from being thrown out in the machining process, and making the machining of the workpiece with convex edge more secure. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is one of the use state diagrams of the present application for clamping a workpiece.

[0018] Figure 2Is the second use state diagram of the invention clamping workpiece.

[0019] Figure 3 Is the explosion diagram of the invention and workpiece.

[0020] Figure 4 Is the perspective view of the invention.

[0021] Figure 5 Is the explosion diagram of the disc body and the claw of the invention.

[0022] Figure 6 Is the explosion diagram of the disc body and the top head assembly of the invention.

[0023] Figure 7 Is the explosion diagram of the fixing seat and the ejector rod of the invention.

[0024] Figure 8 Is the structural schematic diagram of the fastening block and the claw of the invention.

[0025] Figure 9 Is the structural schematic diagram of the fastening block and the claw of the invention.

[0026] Figure 10 Is the perspective view of the claw of the invention.

[0027] Figure 11 Is the structural schematic diagram of the elastic member and the fastening block of the invention.

[0028] Figure 12 Is the explosion diagram of the claw, the fastening device and the elastic plate of the invention.

[0029] Figure 13 Is the structural schematic diagram of the claw and the elastic member of the invention.

[0030] Figure 14 Is the perspective view of the elastic member of the invention.

[0031] Figure 15 Is the explosion diagram of the fastening device and the elastic plate of the invention.

[0032] Figure 16 Is the perspective view of the elastic plate of the invention.

[0033] Figure 17 Is the structural schematic diagram of the fastening device of the invention.

[0034] Figure 18 Is the explosion diagram of the fastening block and the fastening sheet of the invention.

[0035] Figure 19 Is the explosion diagram of the fastening block and the fastening sheet of the invention.

[0036] The meaning represented by the label in the figure:

[0037] 1 - disc body; 2 - clamping jaw; 3 - clamping jaw groove; 4 - clamping portion; 5 - fastening block;

[0038] 7 - elastic plate; 8 - rotating groove; 9 - connecting hole; 10 - rotating hole; 11 - rotating rod;

[0039] 13 - fastening piece; 14 - mounting hole; 15 - waist hole; 16 - mounting rod; 17 - mounting plate;

[0040] 18 - elastic piece; 19 - fixing groove; 20 - connecting portion; 21 - limiting piece; 22 - fixing portion;

[0041] 23 - fixing hole; 24 - perforation; 25 - fixing rod; 26 - fixing seat; 27 - top rod;

[0042] 28 - disc hole; 29 - positioning hole; 30 - positioning rod; 31 - adjusting hole;

[0043] 32 - first tooth; 33 - second tooth; 34 - elastic member; 46 - guide strip; 47 - guide groove. DETAILED DESCRIPTION

[0044] The application will be further described below in conjunction with specific embodiments:

[0045] The utility model provides a novel three -jaw chuck, including disc body 1 and the several claw 2 of sliding setting on disc body 1, be equipped with several claw groove 3 on disc body 1, the claw 2 is arranged in the claw groove 3, be equipped with the drive assembly for driving the claw 2 in the claw groove 3 before and after moving in disc body 1, the clamping part 4 of being extended into the shape is formed on the claw 2, drive the claw 2 to move inwards, the clamping part 4 with the side of workpiece convex edge abuts, be equipped with the fastening device on the clamping part 4, the fastening device includes the fastening piece 13 of fastening block 5 being rotatably arranged on the upper end of clamping part 4 and being fixed to the inboard, be equipped with the pushing device of driving fastening block 5 rotation on the clamping part 4, when fastening block 5 rotates on the clamping part 4, fastening block 5 can drive fastening piece 13 to move downwards and press on the top of workpiece convex edge, to prevent workpiece from throwing out three -jaw chuck when processing, drive assembly is the common device on the three -jaw chuck of market, can drive the claw 2 radial movement by control drive assembly, when the user wants to process the workpiece of the volume larger, length is longer and has convex edge, first put workpiece on disc body 1, then drive the claw 2 on disc body 1 along the claw groove 3 and move inwards by drive assembly, since fastening block 5 rotatably arranged on the upper end of clamping part 4 on the claw 2, and be equipped with the pushing device of driving fastening block 5 rotation on the clamping part 4, when the claw 2 moves inwards to certain position, pushing device will drive fastening block 5 to rotate, when fastening block 5 rotates on the upper end of clamping part 4 on the claw 2, fastening piece 13 on fastening block 5 will drive fastening piece 13 to move downwards, finally clamping part 4 will with the side of workpiece convex edge abuts, and fastening piece 13 moves downwards and will with the upper surface of workpiece convex edge abuts, compared with the claw 2 on the three -jaw chuck of market, when clamping the workpiece of having convex edge, since the claw 2 can only be clamped in the side of workpiece convex edge, the contact surface of claw 2 and workpiece reduces, and workpiece is easy to throw in the processing project and fly, to cause danger, the claw 2 of the utility model not only can provide the transverse clamping force of workpiece through clamping part 4, but also can make fastening piece 13 provide a longitudinal fastening force of workpiece through the fastening piece 13 of fastening block 5 and the upper surface of workpiece convex edge abuts, so that the workpiece of the volume larger, length is longer and has convex edge can be fixed on disc body 1, the fixing effect of workpiece is better, and the situation of throwing out does not occur in the process of processing, so that the workpiece of having convex edge is safer in the process of processing.

[0046] Preferably, the pushing device comprises a resilient plate 7 and a top head assembly fixedly arranged on the surface of the disc body 1, the top head assembly is located on one side or both sides of the clamping jaw 2, the upper end of the resilient plate 7 is connected with the fastening block 5, the lower end of the resilient plate 7 is located on one side or both sides of the clamping jaw 2 and abuts against the outer side of the top head assembly, when the clamping jaw 2 moves inward, the clamping portion 4 drives the fastening block 5 to move inward, the lower end of the resilient plate 7 abuts against the top head assembly and limits the inward movement of the lower end of the resilient plate 7, at this time, the upper end of the resilient plate 7 continues to move inward and rotates around the lower end, the resilient plate 7 rotates and drives the fastening block 5 connected with the upper end of the resilient plate 7 to rotate, the rotation of the fastening block 5 drives the fastening piece 13 to move downward and press the fastening piece 13 on the upper surface of the convex edge of the workpiece; after the user controls the driving assembly to drive the clamping jaw 2 to move inward, when the clamping jaw 2 moves inward to a certain extent, the resilient plate 7 abuts against the top head assembly, at this time, the driving clamping jaw 2 continues to move inward, the fastening block 5 continues to move inward with the clamping jaw 2, but the bottom end of the resilient plate 7 abuts against the top head assembly and cannot continue to move inward, at this time, the upper end of the resilient plate 7 continues to move inward with the fastening block 5 and rotates around the bottom end of the resilient plate 7, the resilient plate 7 rotates and drives the fastening block 5 connected with the upper end of the resilient plate 7 to rotate, so that the fastening piece 13 on the fastening block 5 can press on the upper surface of the convex edge of the workpiece, because the material of the resilient plate 7 is a common high-elasticity steel on the market, which has excellent strength and elasticity and can be repeatedly bent without breaking, and the manufacturer can control the maximum pressure that the high-elasticity steel can withstand according to the needs of different users, so as to avoid the breakage of the resilient plate 7 and improve the service life of the resilient plate 7, and when the clamping portion 4 on the clamping jaw 2 abuts against the outer side of the convex edge of the workpiece, the resilient plate 7 will be bent to a certain extent, so that the fastening piece 13 on the fastening block 5 can contact the upper surface of the convex edge of the workpiece, thereby tightly fastening the convex edge of the workpiece.

[0047] Preferably, the top head assembly comprises a fixed seat 26 and a top rod 27 arranged on the fixed seat 26, one end of the top rod 27 abuts with the lower end of the elastic plate 7, the fixed seat 26 is fixedly installed on the surface of the disc body 1, the fixed seat 26 is provided with a positioning hole 29, the top rod 27 is arranged in the positioning hole 29, and the top rod 27 can be adjusted forward and backward in the adjusting hole 31; the adjusting hole 31 is internally threaded, the top rod 27 is externally threaded, and the length of the top rod 27 exposed in the adjusting hole 31 can be adjusted by rotating the top rod 27. Since the thicknesses of the convex edges on different workpieces are different, when the thickness of the convex edge of the workpiece is slightly different from the thickness of the normally clippable convex edge, for example, when the thickness of the convex edge of the workpiece is thinner than the thickness of the normally clippable convex edge, the user can rotate the top rod 27 to increase the length of the top rod 27 exposed, at this time, after the claw 2 moves inward, the contact time of the top rod 27 with the elastic plate 7 is shortened, so that the buckling block 5 on the clamping part 4 can rotate in advance, and the buckling piece 13 can abut against the upper surface of the convex edge of the workpiece. Conversely, when the workpiece with a thicker convex edge is encountered, the length of the top rod 27 exposed can be shortened, and the user can realize fine adjustment by rotating the top rod 27, so that the workpiece with a small difference in the thickness of the convex edge from the thickness of the normally clippable convex edge can be fixed on the disc body 1, the operation is simple, fast and convenient, and the practicability of the three-jaw chuck is increased.

[0048] Preferably, the disc body 1 is provided with a disc hole 28, the fixed seat 26 is provided with a positioning hole 29, the positioning hole 29 and the disc hole 28 are provided with a positioning rod 30, the inner wall of the claw groove 3 is provided with a guide strip 46, the bottom of the claw 2 is provided with a guide groove 47, and the guide strip 46 is arranged in the guide groove 47; the fixed seat 26 is fixedly installed on the disc body 1 through the positioning rod 30 in the positioning hole 29 and the disc hole 28, so that the fixed seat 26 is more firmly installed, and the user can determine the number of disc holes 28 on the disc body 1 according to the own needs. The fixed seat 26 is installed on the disc body 1 through different disc holes 28, when the thickness of the convex edge of the workpiece is greatly different from the thickness of the normally clippable convex edge, for example, when the thickness of the convex edge of the workpiece is much thinner than the thickness of the normally clippable convex edge, the user can install the fixed seat 26 at a position close to the edge of the disc body 1, at this time, the position of the top rod 27 on the fixed seat 26 also moves outward, after the claw 2 moves inward, the elastic plate 7 will abut against the top rod 27 in advance, after the claw 2 continues to move inward, the buckling block 5 can rotate in advance, so that the buckling piece 13 can abut against the upper surface of the convex edge of the workpiece, thereby fixing the workpiece on the disc body 1. Conversely, when the workpiece with a thicker convex edge is encountered, the user can install the fixed seat 26 at a position far from the edge of the disc body 1, and a larger adjustment can be realized by installing the fixed seat 26 at different positions on the disc body 1, so that the workpieces with different thicknesses of the convex edge can be fixed on the disc body 1, the operation is simple, fast and convenient, and the practicability of the three-jaw chuck is increased.

[0049] Preferably, the upper end of the clamping part 4 is provided with a rotating groove 8, the fastening block 5 is hingedly arranged in the rotating groove 8, the rotating groove 8 is provided with an elastic member 34, the bottom end of the elastic member 34 abuts against the bottom of the rotating groove 8, and the top end of the elastic member 34 abuts against the lower surface of the fastening block 5; when the fastening block 5 rotates in the rotating groove 8, the elastic member 34 will be deformed; after the workpiece is processed, the driving assembly drives the clamping jaw 2 to move outward along the clamping groove 3, at this time, the elastic plate 7 is disengaged from one end of the top head assembly, the deformed elastic member 34 pushes the fastening block 5 to automatically reset, the end of the fastening block 5 with the fastening piece 13 is raised, the bottom end of the fastening piece 13 is raised, and the fastening block 5 does not need to be manually reset, thereby reducing the operation steps; when a new workpiece is processed, the new workpiece is directly placed on the disc body 1, the clamping jaw 2 is driven to move inward, and then the inner side of the clamping part 4 and the bottom end of the fastening piece 13 can abut against each other, so that the workpiece can be fixed on the disc body 1, and the situation that the convex edge side of the new workpiece directly abuts against the fastening piece 13 is avoided.

[0050] Preferably, the elastic member 34 comprises a mounting plate 17 and an elastic piece 18, the mounting plate 17 is in the shape of "L", one end of the mounting plate 17 is arranged in the rotating groove 8, and the elastic piece 18 is arranged at an inclined position on one end of the mounting plate 17; when the fastening block 5 rotates in the rotating groove 8, the elastic piece 18 is pressed down and deformed; when the clamping jaw 2 moves outward, the deformed elastic piece 18 returns to the inclined position, thereby smoothly pushing the fastening block 5 to reset, so that the new workpiece can be fixed on the disc body 1 when being processed.

[0051] Preferably, the rotating groove 8 is provided with connecting holes 9 on both sides, the fastening block 5 is provided with rotating holes 10, and the rotating holes 10 and the connecting holes 9 are provided with rotating rods 11; the fastening block 5 is rotatably arranged in the rotating groove 8 of the clamping part 4 through the connecting holes 9 and the rotating rods 11 in the connecting holes 9, so that the fastening block 5 can normally rotate and will not be separated from the rotating groove 8, and the connection between the fastening block 5 and the clamping part 4 is more stable.

[0052] Preferably, the fastening block 5 is provided with a fixing groove 19, the elastic plate 7 comprises a connecting portion 20 and a limiting piece 21 symmetrically arranged on the connecting portion 20, one end of the top head assembly abuts against the lower end of the limiting piece 21, the fastening block 5 and the clamping portion 4 are arranged between the symmetric limiting pieces 21, the middle portion of the connecting portion 20 is extended to form a fixing portion 22, the fixing portion 22 is arranged in the fixing groove 19, the fixing portion 22 is provided with a fixing hole 23, the fastening block 5 is also provided with a through hole 24 penetrating through the fixing groove 19, the through hole 24 and the fixing hole 23 are provided with a fixing rod 25; the elastic plate 7 is fixedly installed in the fixing groove 19 of the fastening portion through the fixing rod 25 penetrating through the fixing hole 23 of the fixing portion 22 and the through hole 24 of the fastening block 5, so that the connection between the elastic plate 7 and the fastening block 5 is more firm and stable, and the elastic plate 7 will not be loose, and the number of the top head assemblies is two, which are arranged on the two sides of the clamping jaw 2 and abut against the symmetric limiting pieces 21, so that the top head assemblies can better drive the elastic plate 7 to be offset and rotated when the clamping jaw 2 moves inward, thereby more smoothly driving the fastening block 5 to rotate.

[0053] Preferably, the fastening block 5 is also provided with a mounting hole 14, the fastening piece 13 is provided with a waist hole 15, and the waist hole 15 and the mounting hole 14 are provided with a mounting rod 16; the fastening piece 13 is fixedly installed on the fastening block 5 through the mounting rod 16 in the waist hole 15 and the mounting hole 14, so that the connection between the fastening piece 13 and the fastening block 5 is more stable and firm, and the number of the mounting holes 14 on the fastening block 5 is three, the number of the waist holes 15 is two, and the waist hole 15 is in the shape of a long strip; when the user encounters workpieces with different convex edge thicknesses, the mounting rod 16 can be rotated to enable the fastening piece 13 to move along the waist hole 15 for adjustment to a certain extent or the fastening piece 13 can be disassembled from the fastening block 5 and then installed on the fastening block 5 through the mounting hole 14, so as to adjust the length of the fastening piece 13 exposed from the fastening block 5, so that the workpieces with different convex edge thicknesses can be clamped on the disc body 1 by the fastening piece 13.

[0054] Preferably, the inner side of the fastening block 5 is provided with a first tooth 32, and the inner side of the fastening piece 13 is provided with a second tooth 33 engaged with the first tooth 32; the fastening piece 13 is more firmly attached to the fastening block 5, so as to avoid the movement of the fastening piece 13 after the fastening piece 13 abuts against the upper surface of the convex edge of the workpiece.

[0055] The above embodiments are only the preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A novel three-jaw chuck comprising a disc body (1) and a plurality of jaws (2) slidingly arranged on the disc body (1), characterized in that: The disc body (1) is provided with a plurality of clamping groove (3), the clamping jaw (2) is arranged in the clamping groove (3), the disc body (1) is equipped with the drive assembly for driving the clamping jaw (2) in the clamping groove (3) moves back and forth, the clamping jaw (2) is extended and formed with the clamping part (4), the clamping jaw (2) is driven to move inwards, the clamping part (4) is in contact with the side surface of the workpiece convex edge, the clamping part (4) is equipped with the fastening device, the fastening device includes the fastening block (5) rotationally arranged on the upper end of the clamping part (4) and the fastening sheet (13) fixed to the inner side of the fastening block (5), the clamping part (4) is provided with the pusher device for driving the fastening block (5) to rotate, when the fastening block (5) rotates on the clamping part (4), the fastening block (5) can drive the fastening sheet (13) to move downwards and press above the workpiece convex edge, so as to prevent the workpiece from being thrown out of the three-jaw chuck when machining, the pusher device includes the elastic plate (7) and the top head assembly fixedly arranged on the surface of the disc body (1), the top head assembly is located on one side or both sides of the clamping jaw (2), the upper end of the elastic plate (7) is connected with the fastening block (5), the lower end of the elastic plate (7) is located on one side or both sides of the clamping jaw (2) and is in contact with the outer side of the top head assembly, when the clamping jaw (2) moves inwards, the clamping part (4) drives the fastening block (5) to move inwards, the lower end of the elastic plate (7) is in contact with the top head assembly and limits the lower end of the elastic plate (7) to move inwards, at this time, the upper end of the elastic plate (7) continues to move inwards and will rotate around the lower end, the elastic plate (7) rotates and drives the fastening block (5) connected with the upper end to rotate, the fastening block (5) rotates and drives the fastening sheet (13) to move downwards, so that the fastening sheet (13) is pressed above the workpiece convex edge.

2. A novel three jaw chuck as claimed in claim 1, wherein: The top head assembly includes the fixed seat (26) and the top rod (27) arranged on the fixed seat (26), one end of the top rod (27) is in contact with the lower end of the elastic plate (7), the fixed seat (26) is fixedly installed on the surface of the disc body (1), the fixed seat (26) is provided with a positioning hole (29), the top rod (27) is arranged in the positioning hole (29), and the top rod (27) can be adjusted forward and backward in the adjusting hole (31).

3. A novel three jaw chuck as claimed in claim 2, wherein: The disc body (1) is provided with a disc hole (28), the fixed seat (26) is provided with a positioning hole (29), and the positioning hole (29) and the disc hole (28) are provided with a positioning rod (30), the inner wall of the clamping groove (3) is provided with a guide strip (46), the bottom of the clamping jaw (2) is provided with a guide groove (47), and the guide strip (46) is arranged in the guide groove (47).

4. A novel three jaw chuck as claimed in claim 1, wherein: The clamping part (4) is provided with a rotating groove (8), the fastening block (5) is hingedly arranged in the rotating groove (8), the rotating groove (8) is provided with an elastic element (34), the bottom end of the elastic element (34) is in contact with the bottom of the rotating groove (8), and the top end of the elastic element (34) is in contact with the lower surface of the fastening block (5).

5. A novel three jaw chuck as claimed in claim 4, wherein: The elastic element (34) includes a mounting plate (17) and an elastic sheet (18). The mounting plate (17) is L-shaped, with one end of the mounting plate (17) disposed in the rotating groove (8), and the elastic sheet (18) is disposed at one end of the mounting plate (17).

6. A novel three jaw chuck as claimed in claim 4, wherein: The rotating groove (8) has connecting holes (9) on both sides, and the fastening block (5) has a rotating hole (10). The rotating hole (10) and the connecting hole (9) are provided with a rotating rod (11).

7. A novel three jaw chuck as claimed in claim 1, wherein: The fastening block (5) has a fixing groove (19). The elastic plate (7) includes a connecting part (20) and a limiting piece (21) symmetrically arranged on the connecting part (20). One end of the top assembly abuts against the lower end of the limiting piece (21). The fastening block (5) and the clamping part (4) are arranged between the symmetrical limiting pieces (21). The middle part of the connecting part (20) extends to form a fixing part (22). The fixing part (22) is arranged in the fixing groove (19). The fixing part (22) has a fixing hole (23). The fastening block (5) also has a through hole (24) that penetrates the fixing groove (19). The through hole (24) and the fixing hole (23) are provided with a fixing rod (25).

8. A novel three jaw chuck as claimed in claim 1, wherein: The fastening block (5) is also provided with an installation hole (14), and the fastening piece (13) is provided with a waist hole (15). An installation rod (16) is provided in the waist hole (15) and the installation hole (14).

9. A novel three jaw chuck as claimed in any one of claims 1 to 8, wherein: The inner side of the fastening block (5) is provided with a first tooth (32), and the inner side of the fastening piece (13) is provided with a second tooth (33) that meshes with the first tooth (32).

Images